Direct observation of a deoxyadenosyl radical in an active enzyme environment

作者：Heidinger Lorenz; Kneuttinger Andrea C; Kashiwazaki Gengo; Weber Stefan; Carell Thomas; Schleicher Erik^*

来源：FEBS LETTERS, 2016, 590(24): 4489-4494.

DOI：10.1002/1873-3468.12498

• deoxyadenosyl radical
• EPR spectroscopy
• radical intermediate
• radical SAM enzymes
• spore photoproduct lyase

5'-deoxyadenosyl radicals have been proposed as the first common intermediate in the molecular reaction mechanism of the family of radical S-adenosyl-L-methionine (SAM) enzymes. However, this radical species has not yet been directly observed in a catalytically active enzyme environment. In a reduced and SAM-containing C140A mutant of the spore photoproduct lyase from Geobacillus thermodenitrificans, a mutant with altered catalytic activity, we were able to identify an organic radical with pronounced hyperfine structure using electron paramagnetic resonance spectroscopy. Guided by quantum-chemical computations at the density functional theory level of theory, this radical could be tentatively assigned to a deoxyadenosyl radical, which provides first experimental evidence for this intermediate in the reaction mechanism of radical SAM enzymes.

• 出版日期2016-12